[discoveryplus] Subtitle parsing broken: Parse error at position 56 (near '')

Checklist

• I’m reporting a feature request
• I’ve looked through the README
• I’ve verified that I’m running yt-dlp version 2022.02.04. (update instructions)
• I’ve searched the bugtracker for similar issues including closed ones. DO NOT post duplicates
• I’ve read the guidelines for opening an issue

Description

When downloading a video and yt-dlt got a parse error downloading subtitle all video/audio is not downloaded. It should skip only this sub title error.

D:\ytdlp>yt-dlp -vU --cookies-from-browser firefox --no-geo-bypass "https://www.discoveryplus.com/br/video/absurdos-da-engenharia-discovery-br/arranha-ceu-e-o-raio-da-morte" -f hls-3105 -o video.mp4 --write-subs --sub-langs all
[debug] Command-line config: ['-vU', '--cookies-from-browser', 'firefox', '--no-geo-bypass', 'https://www.discoveryplus.com/br/video/absurdos-da-engenharia-discovery-br/arranha-ceu-e-o-raio-da-morte', '-f', 'hls-3105', '-o', 'video.mp4', '--write-subs', '--sub-langs', 'all']
[debug] Portable config "D:\ytdlp\yt-dlp.conf": ['--ffmpeg-location', '.\\ffmpeg\\bin', '--ignore-config']
[Cookies] Extracting cookies from firefox
[debug] Extracting cookies from: "C:\Users\User\AppData\Roaming\Mozilla\Firefox\Profiles\qd7vi5fr.default\cookies.sqlite"
[Cookies] Extracted 2115 cookies from firefox
[debug] Encodings: locale cp1252, fs utf-8, out utf-8 (No ANSI), err utf-8 (No ANSI), pref cp1252
[debug] yt-dlp version 2022.02.04 [c1653e9] (win_exe)
[debug] Python version 3.8.10 (CPython 64bit) - Windows-7-6.1.7601-SP1
[debug] exe versions: ffmpeg N-105453-gcc5eb2e662-20220204 (setts), ffprobe N-105453-gcc5eb2e662-20220204
[debug] Optional libraries: Cryptodome, mutagen, sqlite, websockets
[debug] Proxy map: {}
Latest version: 2022.02.04, Current version: 2022.02.04
yt-dlp is up to date (2022.02.04)
[debug] [DiscoveryPlus] Extracting URL: https://www.discoveryplus.com/br/video/absurdos-da-engenharia-discovery-br/arranha-ceu-e-o-raio-da-morte
[DiscoveryPlus] absurdos-da-engenharia-discovery-br/arranha-ceu-e-o-raio-da-morte: Downloading JSON metadata
[DiscoveryPlus] 2290980: Downloading JSON metadata
[DiscoveryPlus] absurdos-da-engenharia-discovery-br/arranha-ceu-e-o-raio-da-morte: Downloading m3u8 information
[debug] Formats sorted by: hasvid, ie_pref, lang, quality, res, fps, hdr:12(7), vcodec:vp9.2(10), acodec, filesize, fs_approx, tbr, vbr, abr, asr, proto, vext, aext, hasaud, source, id
[debug] Downloading subtitles: pt
[info] 2290980: Downloading 1 format(s): hls-3105
[info] Writing video subtitles to: video.pt.vtt
[debug] Invoking downloader on "https://dplus-br-prod-vod.akamaized.net/b797/e1ea/1329/03698b40-aca3-413d-88d7-319b4a5642ae/ts-raw/hdntl=exp=1645662057~acl=/b797/e1ea/1329/03698b40-aca3-413d-88d7-319b4a5642ae/ts-raw/*~data=hdntl~hmac=f2a7b443dd081a3d1aa9b57451101afd7b5f5cd0be24cc706cc7d1040a967133/caption-pt/subs.m3u8?hdntl=exp=1645662057~acl=/b797/e1ea/1329/03698b40-aca3-413d-88d7-319b4a5642ae/ts-raw/*~data=hdntl~hmac=f2a7b443dd081a3d1aa9b57451101afd7b5f5cd0be24cc706cc7d1040a967133&hdntl=exp=1645662057~acl=/b797/e1ea/1329/03698b40-aca3-413d-88d7-319b4a5642ae/ts-raw/*~data=hdntl~hmac=f2a7b443dd081a3d1aa9b57451101afd7b5f5cd0be24cc706cc7d1040a967133"
[hlsnative] Downloading m3u8 manifest
[hlsnative] Total fragments: 6
[download] Destination: video.pt.vtt
[download] video.pt.vtt.part-Frag1 has already been downloaded
[download]  16.7% of ~336.00B at Unknown speed ETA Unknown (frag 1/6)ERROR: Parse error at position 56 (near '')
Traceback (most recent call last):
  File "yt_dlp\YoutubeDL.py", line 1381, in wrapper
  File "yt_dlp\YoutubeDL.py", line 1465, in __extract_info
  File "yt_dlp\YoutubeDL.py", line 1517, in process_ie_result
  File "yt_dlp\YoutubeDL.py", line 2607, in process_video_result
  File "yt_dlp\YoutubeDL.py", line 2852, in process_info
  File "yt_dlp\YoutubeDL.py", line 3825, in _write_subtitles
  File "yt_dlp\YoutubeDL.py", line 2801, in dl
  File "yt_dlp\downloader\common.py", line 440, in download
  File "yt_dlp\downloader\hls.py", line 355, in real_download
  File "yt_dlp\downloader\fragment.py", line 515, in download_and_append_fragments
  File "yt_dlp\downloader\fragment.py", line 486, in append_fragment
  File "yt_dlp\downloader\hls.py", line 270, in pack_fragment
  File "yt_dlp\webvtt.py", line 364, in parse_fragment
  File "yt_dlp\webvtt.py", line 220, in parse
yt_dlp.webvtt.ParseError: Parse error at position 56 (near '')

This specific site is geo-blocked and account is needed.

If someone help me I can try to fix it.

[fstirlitz]

A duplicate is better than off-topic comments under an unrelated issue.

No, that looks like an actual corrupt download. When you file this separately, can you use --print-traffic and attach at least the final 100 lines or so?

[Bricio]

Today i am not getting this error anymore ( probably discovery fixed subtitle issue ) but i still have .part files. subtitle_parts.zip